Nuclear Quadrupole Relaxation of Nitrogen in Hydrazine

概要

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Six resonance lines due to two non-equivalent positions for each N^<14> nucleus in addition to the nonaxial symmetry of the crystalline field gradient which gives rise to three resonance transitions E_0〓E_+, E_0〓E_- and E_-〓E_+, were observed, and the experiments of saturation recovery were carried out for these lines at liquid nitrogen temperature. The observed frequencies are 4.611MHz, 2.617MHz and 1.994MHz for the system I and 4.567MHz, 2.670MHz and 1.890MHz for the system II at 77°K. Observed recovery of the intensity of the resonance lines after pumping was found to be expressible as the sum of two exponential terms. The transition probabilities of the I thermal spinlattice relaxation between the two of the above three transitions were determined. The observed time constants of the relaxation, T_<1s> and T_<1l>, and the transition probabilities, W_Δ, W_-, and W_+, corresponding to E_-〓E_+, E_0〓E_- and E_0〓E_+ are as follows: For the system I; T_<1s> = 1.4±0.1 and T_<1l> = 3.6±0.1 (min). W_Δ = 0.091±0.030, W_-_= 0.221±0.030 and W_+ = 0.516±0.030 (×10^<-1>sec^<-1>). For the system II; T_<1s> = 1.3±0.1 and T_<1l> = 3.8±0.1 (min). W_Δ = 0.110±0.030, W_- = 0.193±0.030 and W_+ = 0.557±0.030 (× 10^<-1>sec^<-l>). Pumping experiment clarified that the cross interactions exist between two different spin systems.
社団法人日本物理学会の論文
1967-07-05